<script setup lang="ts">
import { computed, onMounted,  ref, watch } from "vue";

// 定义水果对象的类型
interface Fruit {
  id: number;
  icon: string;
  isChecked: boolean;
  num: number;
  price: number;
}
onMounted(() => {
  getDataFromStorage();
});
// 从本地存储中读取数据
const getDataFromStorage = () => {
  const str = localStorage.getItem("fruit");
  if (str) {
    const parseObj = JSON.parse(str) as Fruit[];
    if (parseObj.length) {
      fruitList.value = parseObj;
    }
  }
};
// 水果列表
const fruitList = ref<Fruit[]>([
  {
    id: 1,
    icon: "https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/ll.png",
    isChecked: true,
    num: 2,
    price: 6,
  },
  {
    id: 2,
    icon: "https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/smt.png",
    isChecked: false,
    num: 7,
    price: 20,
  },
  {
    id: 3,
    icon: "https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/tg.png",
    isChecked: false,
    num: 3,
    price: 40,
  },
  {
    id: 4,
    icon: "https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/xg.png",
    isChecked: false,
    num: 10,
    price: 3,
  },
  {
    id: 5,
    icon: "https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/yl.png",
    isChecked: false,
    num: 20,
    price: 34,
  },
]);
const delFruit = (id: number) => {
  const index = fruitList.value.findIndex((item) => item.id === id);
  if (index > -1) {
    fruitList.value.splice(index, 1);
  }
};
const isAllChecked = computed({
  get() {
    return fruitList.value.every((item) => item.isChecked);
  },
  set(value: boolean) {
    fruitList.value.forEach((item) => (item.isChecked = value));
  },
});
const selectFruits = computed(() =>
  fruitList.value.filter((item) => item.isChecked)
);
const allCount = computed(() =>
  selectFruits.value.reduce((preValue, item) => item.num + preValue, 0)
);
const allPrice = computed(() =>
  selectFruits.value.reduce(
    (preValue, item) => item.num * item.price + preValue,
    0
  )
);
watch(
  fruitList,
  () => {
    localStorage.setItem("fruit", JSON.stringify(fruitList.value));
  },
  {
    deep: true,
  }
);
</script>

<template>
  <div class="app-container" id="app">
    <!-- 顶部banner -->
    <div class="banner-box">
      <img
        src="https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/sg_top.png"
        alt=""
      />
    </div>
    <!-- 面包屑 -->
    <div class="breadcrumb">
      <span>🏠</span>
      /
      <span>购物车</span>
    </div>
    <!-- 购物车主体 -->
    <div v-if="fruitList.length" class="main">
      <div class="table">
        <!-- 头部 -->
        <div class="thead">
          <div class="tr">
            <div class="th">选中</div>
            <div class="th th-pic">图片</div>
            <div class="th">单价</div>
            <div class="th num-th">个数</div>
            <div class="th">小计</div>
            <div class="th">操作</div>
          </div>
        </div>
        <!-- 身体 -->
        <div class="tbody">
          <div v-for="item in fruitList" :key="item.id" class="tr active">
            <div class="td">
              <input type="checkbox" v-model="item.isChecked" />
            </div>
            <div class="td">
              <img :src="item.icon" alt="" />
            </div>
            <div class="td">{{ item.price }}</div>
            <div class="td">
              <div class="my-input-number">
                <button
                  class="decrease"
                  :disabled="item.num <= 1"
                  @click="item.num--"
                >
                  -
                </button>
                <span class="my-input__inner">{{ item.num }}</span>
                <button class="increase" @click="item.num++">+</button>
              </div>
            </div>
            <div class="td">{{ item.num * item.price }}</div>
            <div class="td">
              <button @click="delFruit(item.id)">删除</button>
            </div>
          </div>
        </div>
      </div>
      <!-- 底部 -->
      <div class="bottom">
        <!-- 全选 -->
        <label class="check-all">
          <input type="checkbox" v-model="isAllChecked" />
          全选
        </label>
        <div class="right-box">
          <!-- 所有商品总价 -->
          <span class="price-box"
            >总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price">{{
              allPrice
            }}</span></span
          >
          <!-- 结算按钮 -->
          <button class="pay">结算( {{ allCount }} )</button>
        </div>
      </div>
    </div>
    <!-- 空车 -->
    <div v-else class="empty">🛒空空如也</div>
  </div>
</template>

<style scoped>
@import "../style/inputnumber.css";
@import "../style/index.css";
</style>
